Yup but like alt+tab the game doesn't like it sometimes
Indeed, on occasion, bioshock.exe has even stopped running on going back to native resolution from windowed mode.
Sometimes when going back from say 1280x800 windowed to 1920x1200 fullscreen (Vista, DX10), the game puts 0.25 inch black bars at the top and bottom.
I find that if I first go to fullscreen at the lower resolution, then afterward bump the resolution back to 1920x1200, the black bars disappear and everything works the way it should.
[Edited by JerseySeven, 8/30/2007 2:00:13 PM]